RATE AND OTHER REGULATORY MATTERS (Details 3) (USD $) In Millions, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Dec. 31, 2012	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Regulatory Liabilities [Line Items]
Regulatory Assets, Noncurrent	$ 1,564.0	$ 1,360.0
Regulatory Liabilities	857	966
SCEG
Regulatory Liabilities [Line Items]
Public Utilities, Percent Increase (Decrease) in Retail Natural Gas Rates	0.60%		2.10%
Regulatory Assets, Noncurrent	1,506.0	1,303.0
Public Utilities, Percent Increase (Decrease) in Retail Electric Rates	2.80%	2.90%	2.30%
Public Utilities, Authorized Allowable Return on Common Equity, Percentage	11.00%
Demand Side Management Program Costs, Noncurrent				15.4	16.9	19.6
Regulatory Liabilities	615	732	732
Annual Storm Damage Costs not offset by Amounts Recovered through Electric Rates	2.5
Amount Allowed to be Recovered through Electric Rates to Offset Incremental Storm Damage Costs	100
PSNC Energy [Member]
Regulatory Liabilities [Line Items]
Regulatory Assets, Noncurrent	1.1
Asset Retirement Obligation Costs [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities	719	695
Asset Retirement Obligation Costs [Member] | SCEG
Regulatory Liabilities [Line Items]
Regulatory Liabilities	509	495
Storm damage reserve [Member]
Regulatory Liabilities [Line Items]
Storm Damage Reserve Applied To Offset Net Lost Margin Related To DSM	5.0
Regulatory Liabilities	6	27
Annual Storm Damage Costs not offset by Amounts Recovered through Electric Rates	2.5
Amount Allowed to be Recovered through Electric Rates to Offset Incremental Storm Damage Costs	100
Storm damage reserve [Member] | SCEG
Regulatory Liabilities [Line Items]
Regulatory Liabilities	6
Monetization bankruptcy claim [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities	27	29
Deferred gains on interest rate derivatives [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities	83	181
Deferred gains on interest rate derivatives [Member] | SCEG
Regulatory Liabilities [Line Items]
Regulatory Liabilities	83
Deferred Income Tax Charges [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities	22	24
Deferred Income Tax Charges [Member] | SCEG
Regulatory Liabilities [Line Items]
Regulatory Liabilities	17	19
Planned major maintenance [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0	10
Planned major maintenance [Member] | SCEG
Regulatory Liabilities [Line Items]
Regulatory Liabilities	$ 0